Mantle structure for gyratory crusher



United States Patent Ofiice 3,076,612 Patented Feb. 5, 1963 Manufacturing Company, Milwaukee, Wis, a corporatlon of Wisconsin Filed Dec. 16, 1960, Ser. No. 76,297 2 Claims. (Cl. 241-295) This invention is in the field of wearing parts for gyratory crushers and the like and is concerned with a mantle set with an interlock making the wearing parts automatically self-tightening.

A primary object is a mantle set which greatly simplifies manufacture.

Another object is a mantle with a socket at its upper inner peripheral seat or throat.

Another object is a mantle extension with a locking pro ection at its lower outer edge adapted to fit in the mantle socket. V Another object is an interlock for a mantle set for use n a gyratory crusher which simplifies and speeds up grindmg and finishingof the mantle parts.

Other objects will-appear from time to time in the ensuing specification and drawings in which:

FIGURE 1 is a vertical section through the head of a gyratory crusher;

FIGURE 2 is an enlargement of the interlock shown in FIGURE 1;

FIGURE 3 is a top View of the parts in FIGURE 2, separated;

FIGURE 4 is a sect-ion similar to FIGURE 2 of a modified form; and

FIGURE 5 is a section along line 55 of FIGURE 4.

I have not shown the main frame and bowl structure of a gyratory crusher in FIGURE 1 since these may be conventional. I have only shown the gyrating head and its related parts and the drive has also been omitted since it is not important.

The head has a main shaft 12 with an extension 14 suitably bolted, as at 16, above the main shaft on the head. The threaded upper end 18' of the extension carries a main shaft nut 20 which applies a downward thrust through a torch ring 22 or the like to a mantle extension 24. The lower edge of the mantle extension in turn abuts the upper edge of the mantle 26.

Both the mantle and mantle extension may be considered to make up a set of wearing elements which, during crushing, are intended to wear out and be replaced. Both are preferably made of manganese steel or its equivalent. Both may be considered to be generally firusto-conic, one being an extension of the other, and in certain situations the mantle may define a cavity or chamber 28 along its inner surface next to the head at least for a substantial portion of the length of the mantle for a backing material, such as molten zinc or the like.

The lower edge surface 30 of the mantle extension may be considered fiat, except as hereinafter set forth, and generally frusto-oonical so that it matches the flat conical upper edge surface 32 of the mantle. The upper inner opening of the frusto-con-ical mantle may be referred to as the throat, and the surface 32 firmly abuts the lower edge surface 30 of the mantle extension thereby passing the thrust of the head nut 20 from the mantle extension down through the mantle to the mantle seating 34 on the head.

I provide at least two notches or sockets 36 in the upper edge surface of the mantle. Each notch opens through the upper edge surface 32 and also through the inner surface 38 of the mantle, but not through the front or outer wearing surface 40. I also provide a projection 42 extending down and out from the lower edge surface 30 of the mantle extension. The projection extends from a location next to the inner surface 44 and is intended to be axially aligned with the mantle socket such that, when fully inserted in the mantle socket, the surfaces 30 and 32 will abut without the projection hitting the inner wall 46 of the socket.

It will be noted in FIGURE 3 that the side surfaces 48 of the socket are tapered somewhat, and this taper may be matched by a corresponding taper on the side of the projection, as at 50. In any event, the projection fits in the socket without contact except along one tapered side. I prefer one projection on the mantle extension and two or more sockets, equidistantly spaced around the upper edge of the mantle.

In FIGURES 4 and 5 an alternate form has been shown in which I extend the inner surface of the mantle somewhat, at 52, inwardly on each side of the socket to insure full engagement between the tapered side walls of the socket and projection. In many cases the throat of the mantle may be substantially out-of-round. By giving the socket additional radial extent, I insure firm peripheral contact between the tapered sides of the socket and the projection.

' I prefer to remove or core back the inner portion of the lower outer edge of the mantle extension, as at 54. The cored back portion is peripherally aligned with the projection. Thus, this area does not have to be machined and in no event will it interfere with or contact the throat surface 32 of the mantle.

I may provide pouring openings 56, shown in this case at two degrees apart, so that the backing material may be poured in one while the other vents. I may also use a removable pouring spout 58, if desired.

The use, operation and function of my invention are as follows:

I provide an interlock for a mantle set which greatly simplifies grinding and finishing of the mantle parts. The seat at the upper end or throat of the mantle can be simply and quickly ground when the mantle is positioned upright in a turntable without any interference. The projection on the mantle extension does not interfere with the machining of the lower edge of the mantle extension. And the portion of the abutting surface of the mantle extension peripherally aligned with the projection is cored back to prevent interference between the two abutting surfaces.

A mantle set of this type may be used where it is to be backed with a suitable backing material, such as zinc, or on ground back manganese where no backing material is used.

Additionally, the interlock does not project inwardly of the inner surfaces of the mantle and mantle extension so that the location of the abutting surfaces can be either above or below the top of the head. This is particularly advantageous in ground back manganese with no backing material.

Further, the interlock will be effective even through the cast mantle may be substantially out-of-round.

In the case of a ground back mantle, the socket or sockets do not interfere with grinding.

The basic advantage of a mantle set of this type is that the mantle will be self-tightening. The thrust or torque of the head nut will be self-tightening. Also, the outer and inner surfaces will not have any extending projections or other interruptions which will hinder grinding or finishing.

While I have shown and described a preferred form and one modification of my invention, it should be understood that suitable additional modifications, substitutions and alterations may be made without departing from the inventions fundamental theme. I, therefore, wish that the invention be unrestricted, except as by the appended claims.

I claim:

1. For use in a gyratory crusher having an outwardly and downwardly flaring head adapted to define a concave crushing cavity with an overhanging bowl, the improvement comprising a frusto-conic mantle set adapted to be disposed on the head as a wearing and replacement assembly, the set including a frusto-conic mantle adapted to be disposed on the head, small end up, a throat at the small upper end of the mantle defining a conical seat, an annular generally frusto-conic mantle extension adapted to be disposed on the head with its outer lower peripheral edge in engagement with the conical seat at the throat of the mantle, and an interlock between the conical seat at the throat of the mantle and the outer lower peripheral edge of the mantle extension, including at least one socket, with side surfaces diverging inwardly, and a generally flat inner wall in the mantle opening through the seat at the throat and through the inner surface of the mantle, but not through the outer surface, the generally flat inner wall of the socket being disposed generally vertically when the mantle is mounted on the head of a crusher, and a projection urged on the mantle extension extending from the outer lower peripheral edge thereof and disposed substantially completely between the imaginary extensions of the inner and outer surfaces of the mantle extension out of contact with the flat inner wall of the socket, when properly mounted.

2. For use in a gyratory crusher having an outwardly and downwardly flaring head adapted to define a concave crushing cavity with an overhanging bowl, the improvement comprising a frusto-conic mantle adapted to be disposed on the head as a wearing and replacement part, the upper inner edge of the mantle being disposed on the head, small end up, a throat at the small upper end of the mantle defining a conical seat adapted to be engaged by the outer lower peripheral edge of a frusto-conic man- References Cited in the file of this patent UNITED STATES PATENTS 1,066,277 Hunter July 1, 1913 1,154,100 De Wein Sept. 21, 1915 1,424,792 Ackermann Aug. 8, 1922 1,459,305 Kennedy June 19, 1923 1,592,312 Symons July 13, 1926 2,971,705 Werner Feb. 14, 1961 

1. FOR USE IN A GYRATORY CRUSHER HAVING AN OUTWARDLY AND DOWNWARDLY FLARING HEAD ADAPTED TO DEFINE A CONCAVE CRUSHING CAVITY WITH AN OVERHANGING BOWL, THE IMPROVEMENT COMPRISING A FRUSTO-CONIC MANTLE SET ADAPTED TO BE DISPOSED ON THE HEAD AS A WEARING AND REPLACEMENT ASSEMBLY, THE SET INCLUDING A FRUSTO-CONIC MANTLE ADAPTED TO BE DISPOSED ON THE HEAD, SMALL END UP, A THROAT AT THE SMALL UPPER END OF THE MANTLE DEFINING A CONICAL SEAT, AN ANNULAR GENERALLY FRUSTO-CONIC MANTLE EXTENSION ADAPTED TO BE DISPOSED ON THE HEAD WITH ITS OUTER LOWER PERIPHERAL EDGE IN ENGAGEMENT WITH THE CONICAL SEAT AT THE THROAT OF THE MANTLE, AND AN INTERLOCK BETWEEN THE CONICAL SEAT AT THE THROAT OF THE MANTLE AND THE OUTER LOWER PERIPHERAL EDGE OF THE MANTLE EXTENSION, INCLUDING AT LEAST ONE SOCKET, WITH SIDE SURFACES DIVERGING INWARDLY, AND A GENERALLY FLAT INNER WALL IN THE MANTLE OPENING THROUGH THE SEAT AT THE THROAT AND THROUGH THE INNER SURFACE OF THE MANTLE, BUT NOT THROUGH THE OUTER SURFACE, THE GENERALLY FLAT INNER WALL OF THE SOCKET BEING DISPOSED GENERALLY VERTICALLY WHEN THE MANTLE IS MOUNTED ON THE HEAD OF A CRUSHER, AND A PROJECTION URGED ON THE MANTLE EXTENSION EXTENDING FROM THE OUTER LOWER PERIPHERAL EDGE THEREOF AND DISPOSED SUBSTANTIALLY COMPLETELY BETWEEN THE IMAGINARY EXTENSIONS OF THE INNER AND OUTER SURFACES OF THE MANTLE EXTENSION OUT OF CONTACT WITH THE FLAT INNER WALL OF THE SOCKET, WHEN PROPERLY MOUNTED. 